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Lerner Texaco <br /> 521 North Cherokee Lane, Lodi <br /> Site Code: 1324 <br /> 19 April 1997 <br /> Page 2 <br /> Based on the results of the CPT survey, it appears that vapor extraction may be a viable <br /> remediation alternative. Therefore, several vapor wells should be installed to allow testing <br /> and remediation (if deemed necessary). <br /> Work Plan Addendum: <br /> This addendum provides the proposed locations and rationale for the wells/borings <br /> recommended above. Each of the wells/borings will be installed in accordance with the <br /> 13 March 1994 work plan unless either otherwise stated herein or discussed with (and <br /> approved by) the lead regulatory agency (SJCPHD/EHD). <br /> Well Survey: <br /> A survey of supply wells will be performed. Based on current guidelines by the <br /> Central Valley Regional Water Quality Control Board (CVRWQCB), the survey will <br /> be performed for wells within 2,000 feet of the site. The survey will include <br /> reviewing the State of California, Department of Water Resources records and <br /> contacting the water purveyor(s) with the 2,000 foot survey area. <br /> Air Sampling: <br /> Five air samples are proposed. Each of the samples will be collected in a Summa <br /> canister held approximately 5-feet above ground surface (assumed breathing zone). <br /> Three of the samples will be collected outdoors while two will be collected from <br /> within the structure. <br /> One outdoor sample will be collected off-site up-wind to assess "background" <br /> volatile concentrations. A second outdoor sample will be collected in the dispenser <br /> area. The third sample will be collected from above the previous location of the <br /> USTs. <br /> One indoor sample will be collected from each of the two rooms (office and rest <br /> room) of the structure. Because the structure's main bay is used for automobile <br /> repair, sources of volatile organic emissions beyond the scope of this assessment <br /> will render any sampling meaningless. <br /> Soil Borings: <br /> Two soil borings (B-4 and B-5) will be advanced in the pump island area (Plate 3 <br /> from the 1 August 1995 work plan has been attached for your convenience). <br /> Because of the limited access, the borings will be slant drilled to allow the collection <br /> of a soil sample beneath each end of each pump island. It is anticipated that the <br /> southern end samples can be collected at a depth of approximately 5 feet below <br />